Rectifier compound.



' No Drawing.

UNITED s'raans PATENT OFFICE.

NATHAN FALLEK, OF DENVER, COLORADO, ASSIGNOR 'IJO THE COOK RAILWAY SIGNAL COMPANY, OF DENVER, COLORADO, A CORPORATION OF COLORADO.

RECTIFIER COMPOUND.

To all whom it may concern:

Be it known that I, NATHAN FALLEK, a citizen of the United States, residing in the city and county of Denver and State of Colorado, have invented certain new and dium silicate and water re ared in the following manner: I mix one pound of the sodium phosphate in two gallons of water, (preferably distilled). The asbestos, (preferably white or unbleached), should be boiled in distilled water for one hour approximately, for the purpose of removing all. impurities. It is then wrungout of the water and dried until all the moisture has been removed. Enough of the asbestos, prepared asaforesaid, is then placed in the said solution of sodium phosphate to completely absorb the latter.

Thesodium silicate, which is in powder form, is slowly poured into distilled. water, which is rapidly stirred in order to thoroughly dissolve the powder. Enough of the sodium silicate is put into the Water to raise the specific gravity of the solution, when subjected to, the hydrometer test, to 1.180. This is based on the assumption that the specific gravity of the distilled water is 1.000. .By employing sodium silicate, evaporation is prevented, since the said silicate will form a film surrounding the composition and thus envelop the latter.

Assuming that 16 partsby weight designates the quantity of the compound to be formed, a quantity of the asbestos and sodium phosphate, equal to 15 of these parts, is taken and one part by weight of the sodium silicate solution is added thereto, completing the compound which is in the form of a thick pulp, making an approximately dry composition which may then be intro- Specification of Letters Patent.

Application filed October 12, 1912.

Patented Oct. 5, 1915.

Serial No. 725,430.

duced into the rectifier, filling the chamber of the latter between the elements, as aluminum and lead.

It should be further stated that although I prefer to prepare the compound as above described, I may substitute for the sodium phosphate a phosphate of some other one of the elements, such as magnesium, potassium or ammonium, of the group generally designated the sixth chemical group. Further, instead of employing all of the ingredients as above described, I may use only sodium phosphate and water, or a phosphat of some other of the elements of the chemical group to which sodium belongs, as, for instance, magnesium phosphate, potassium phosphate or ammonium orthophosphate and water.

Having thus described my invention, what I claim is:

1. A. compound for electrical rectifiers consisting of sodium phosphate, asbestos, sodium silicate, and water, in substantially the proportions specified.

2. Ihe herein described composition of matter for use as a rectifier compound consisting of dilute solution of sodium phosphate, a sutlicient quantity of asbestos to absorb the sodium phosphate, and one part by weight of a solution of sodium silicate to 15 parts byweight of the sodium phosphate solution and asbestos.

3. Ihe herein described composition of matter for use as a compound for electrical rectifiers consisting of sodium phosphate, water, asbestos, and sodium silicate solution, in the proportion of one pound of sodium phosphate to two gallons of Water, enough asbestos to absorb the said solution, and one part by weight of the sodium silicate solution to 15 parts by weight of the sodium phosphate solution and asbestos.

4. A. composition of matter for use as a compound for electrical rectifier-s consisting of sodium phosphate, asbestos, sodium silicate, and water, in the proportion of one pound of sodium phosphate to two gallons of water, enough asbestos to absorb the said sodium phosphate solution, enough sodium silicate to raise distilled Water to the spewater, in substantially the proportions cific gravity of 1.180, hydrometer test, .one specified. 0 part by Weight of this sodium silicate solu- In testimony whereof I afiix my signature tion being used for 15 parts by Weight of in presence of two Witnesses. .3 the sodium phosphate solution and asbestos. NATHAN FALLEK.

5. A compound for electrical rectifiers Witnesses: consisting of a phosphate of one of the al- A. J. OBRIEN,

kali metals, asbestos, sodium silicate, and MAY CLEMENTs. 

